I have seen NiteRider Trail Rat 2.0/Road Rat 2.0 systems online for $70 on sale every now and again...
It's 20 bucks more here, but with free shipping...
http://www.jensonusa.com/store/produ...Rat+20+06.aspx
Or you could opt for this blackburn system.
http://www.jensonusa.com/store/produ...System+X6.aspx
Neither of these systems are the latest or greatest, but they have come down quite a bit in price.
This is a big step up from the "be seen" lights to the "lights to see with" catagory. You will not be disapointed... Cheers!